---
title: "CVE-2026-107573: Progressive Robot hMailServer - Broken Access Control"
description: "Progressive Robot hMailServer 6.0.0 through 6.3.5 contains an information disclosure vulnerability caused by incorrect default permissions on installer-created files and folders, letting local authenticated users read sensitive mail server data, exploit requires local user access."
url: https://panop.io/threat-heartbeat/CVE-2026-107573/
---

# CVE-2026-107573 Progressive Robot hMailServer - Broken Access Control

Progressive Robot hMailServer 6.0.0 through 6.3.5 contains an information disclosure vulnerability caused by incorrect default permissions on installer-created files and folders, letting local authenticated users read sensitive mail server data, exploit requires local user access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107573)

## Details

Type

Broken Access Control

Impact

Information Disclosure, File System Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-276](https://cwe.mitre.org/data/definitions/276.html)

## Vendor fix

Update to a version later than 6.3.5 or apply patches that correct default permissions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107573](https://nvd.nist.gov/vuln/detail/CVE-2026-107573)
- [https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.6](https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.6)
- [https://gitlab.com/hmailserver/hmailserver/-/work\_items/77](https://gitlab.com/hmailserver/hmailserver/-/work_items/77)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)